{"id":172517,"date":"2024-11-07T13:47:22","date_gmt":"2024-11-07T05:47:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/172517\/"},"modified":"2024-11-07T13:47:23","modified_gmt":"2024-11-07T05:47:23","slug":"%e5%a6%82%e4%bd%95%e9%81%bf%e5%85%8d%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a7%b8%e7%99%bc%e5%99%a8%e9%87%8d%e8%a4%87%e6%8f%92%e5%85%a5%e6%95%b8%e6%93%9a%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a7%b8%e7%99%bc","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/172517\/","title":{"rendered":"\u5982\u4f55\u907f\u514d\u6578\u64da\u5eab\u89f8\u767c\u5668\u91cd\u8907\u63d2\u5165\u6578\u64da\uff1f (\u6578\u64da\u5eab\u89f8\u767c\u5668\u4e0d\u80fd\u91cd\u8907\u63d2\u5165)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e9%81%bf%e5%85%8d%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a7%b8%e7%99%bc%e5%99%a8%e9%87%8d%e8%a4%87%e6%8f%92%e5%85%a5%e6%95%b8%e6%93%9a%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a7%b8%e7%99%bc-uQeAHPCFgb\">\u5982\u4f55\u907f\u514d\u6578\u64da\u5eab\u89f8\u767c\u5668\u91cd\u8907\u63d2\u5165\u6578\u64da\uff1f (\u6578\u64da\u5eab\u89f8\u767c\u5668\u4e0d\u80fd\u91cd\u8907\u63d2\u5165)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u81ea\u52d5\u57f7\u884c\u7279\u5b9a\u64cd\u4f5c\uff0c\u4f8b\u5982\u5728\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u6578\u64da\u6642\u3002\u7136\u800c\uff0c\u7576\u89f8\u767c\u5668\u4e0d\u7576\u8a2d\u7f6e\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u91cd\u8907\u63d2\u5165\u6578\u64da\u7684\u554f\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u907f\u514d\u6578\u64da\u5eab\u89f8\u767c\u5668\u91cd\u8907\u63d2\u5165\u6578\u64da\u7684\u60c5\u6cc1\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u89e3\u6c7a\u65b9\u6848\u548c\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a7%b8%e7%99%bc%e5%99%a8%ef%bc%9f-uQeAHPCFgb\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u89f8\u767c\u5668\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5b58\u5132\u7a0b\u5e8f\uff0c\u5b83\u6703\u5728\u7279\u5b9a\u4e8b\u4ef6\u767c\u751f\u6642\u81ea\u52d5\u57f7\u884c\u3002\u9019\u4e9b\u4e8b\u4ef6\u901a\u5e38\u5305\u62ec\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u3002\u89f8\u767c\u5668\u53ef\u4ee5\u7528\u4f86\u5f37\u5236\u57f7\u884c\u696d\u52d9\u898f\u5247\u3001\u9a57\u8b49\u6578\u64da\u5b8c\u6574\u6027\u6216\u81ea\u52d5\u8a18\u9304\u8b8a\u66f4\u3002<\/p>\n<h2 id=\"%e9%87%8d%e8%a4%87%e6%8f%92%e5%85%a5%e6%95%b8%e6%93%9a%e7%9a%84%e5%8e%9f%e5%9b%a0-uQeAHPCFgb\">\u91cd\u8907\u63d2\u5165\u6578\u64da\u7684\u539f\u56e0<\/h2>\n<p>\u91cd\u8907\u63d2\u5165\u6578\u64da\u7684\u554f\u984c\u901a\u5e38\u6e90\u65bc\u4ee5\u4e0b\u5e7e\u500b\u539f\u56e0\uff1a<\/p>\n<ul>\n<li><strong>\u7f3a\u4e4f\u552f\u4e00\u6027\u7d04\u675f\uff1a<\/strong>\u5982\u679c\u6578\u64da\u8868\u4e2d\u6c92\u6709\u8a2d\u7f6e\u552f\u4e00\u6027\u7d04\u675f\uff0c\u5247\u53ef\u4ee5\u63d2\u5165\u91cd\u8907\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u89f8\u767c\u5668\u908f\u8f2f\u932f\u8aa4\uff1a<\/strong>\u89f8\u767c\u5668\u7684\u908f\u8f2f\u8a2d\u8a08\u4e0d\u7576\uff0c\u53ef\u80fd\u5c0e\u81f4\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u91cd\u8907\u57f7\u884c\u63d2\u5165\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u4e26\u767c\u64cd\u4f5c\uff1a<\/strong>\u5728\u9ad8\u4e26\u767c\u74b0\u5883\u4e2d\uff0c\u53ef\u80fd\u6703\u51fa\u73fe\u591a\u500b\u9032\u7a0b\u540c\u6642\u5617\u8a66\u63d2\u5165\u76f8\u540c\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%81%bf%e5%85%8d%e9%87%8d%e8%a4%87%e6%8f%92%e5%85%a5%e7%9a%84%e7%ad%96%e7%95%a5-uQeAHPCFgb\">\u907f\u514d\u91cd\u8907\u63d2\u5165\u7684\u7b56\u7565<\/h2>\n<h3 id=\"1-%e8%a8%ad%e7%bd%ae%e5%94%af%e4%b8%80%e6%80%a7%e7%b4%84%e6%9d%9f-uQeAHPCFgb\">1. \u8a2d\u7f6e\u552f\u4e00\u6027\u7d04\u675f<\/h3>\n<p>\u5728\u6578\u64da\u8868\u4e2d\u8a2d\u7f6e\u552f\u4e00\u6027\u7d04\u675f\u662f\u9632\u6b62\u91cd\u8907\u6578\u64da\u7684\u6700\u6709\u6548\u65b9\u6cd5\u4e4b\u4e00\u3002\u9019\u53ef\u4ee5\u901a\u904e\u5728\u5275\u5efa\u8868\u6642\u6307\u5b9a\u552f\u4e00\u9375\u4f86\u5be6\u73fe\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    id INT PRIMARY KEY,\n    email VARCHAR(255) UNIQUE\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u96fb\u5b50\u90f5\u4ef6\u5b57\u6bb5\u88ab\u8a2d\u7f6e\u70ba\u552f\u4e00\uff0c\u9019\u6a23\u5c31\u7121\u6cd5\u63d2\u5165\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e8%a7%b8%e7%99%bc%e5%99%a8%e9%80%b2%e8%a1%8c%e6%aa%a2%e6%9f%a5-uQeAHPCFgb\">2. \u4f7f\u7528\u89f8\u767c\u5668\u9032\u884c\u6aa2\u67e5<\/h3>\n<p>\u5982\u679c\u9700\u8981\u4f7f\u7528\u89f8\u767c\u5668\u4f86\u8655\u7406\u63d2\u5165\u64cd\u4f5c\uff0c\u53ef\u4ee5\u5728\u89f8\u767c\u5668\u4e2d\u6dfb\u52a0\u6aa2\u67e5\u908f\u8f2f\uff0c\u4ee5\u78ba\u4fdd\u4e0d\u6703\u63d2\u5165\u91cd\u8907\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE TRIGGER before_insert_user\nBEFORE INSERT ON users\nFOR EACH ROW\nBEGIN\n    DECLARE user_count INT;\n    SELECT COUNT(*) INTO user_count FROM users WHERE email = NEW.email;\n    IF user_count &gt; 0 THEN\n        SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = '\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740';\n    END IF;\nEND;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5728\u63d2\u5165\u65b0\u7528\u6236\u4e4b\u524d\u6aa2\u67e5\u96fb\u5b50\u90f5\u4ef6\u662f\u5426\u5df2\u5b58\u5728\uff0c\u5982\u679c\u5b58\u5728\u5247\u5f15\u767c\u932f\u8aa4\uff0c\u9632\u6b62\u63d2\u5165\u3002<\/p>\n<h3 id=\"3-%e5%af%a6%e6%96%bd%e4%ba%8b%e5%8b%99%e6%8e%a7%e5%88%b6-uQeAHPCFgb\">3. \u5be6\u65bd\u4e8b\u52d9\u63a7\u5236<\/h3>\n<p>\u5728\u9ad8\u4e26\u767c\u74b0\u5883\u4e2d\uff0c\u4f7f\u7528\u4e8b\u52d9\u63a7\u5236\u53ef\u4ee5\u5e6b\u52a9\u907f\u514d\u91cd\u8907\u63d2\u5165\u3002\u901a\u904e\u5c07\u63d2\u5165\u64cd\u4f5c\u5305\u88dd\u5728\u4e8b\u52d9\u4e2d\uff0c\u53ef\u4ee5\u78ba\u4fdd\u64cd\u4f5c\u7684\u539f\u5b50\u6027\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>START TRANSACTION;\nINSERT INTO users (email) VALUES ('test@example.com');\nCOMMIT;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5728\u63d2\u5165\u904e\u7a0b\u4e2d\u4e0d\u6703\u6709\u5176\u4ed6\u64cd\u4f5c\u5e72\u64fe\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-uQeAHPCFgb\">\u7d50\u8ad6<\/h2>\n<p>\u907f\u514d\u6578\u64da\u5eab\u89f8\u767c\u5668\u91cd\u8907\u63d2\u5165\u6578\u64da\u662f\u4e00\u500b\u91cd\u8981\u7684\u8ab2\u984c\uff0c\u5c24\u5176\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u901a\u904e\u8a2d\u7f6e\u552f\u4e00\u6027\u7d04\u675f\u3001\u4f7f\u7528\u89f8\u767c\u5668\u9032\u884c\u6aa2\u67e5\u4ee5\u53ca\u5be6\u65bd\u4e8b\u52d9\u63a7\u5236\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u9632\u6b62\u91cd\u8907\u6578\u64da\u7684\u63d2\u5165\u3002\u9019\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9084\u80fd\u63d0\u5347\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u9760\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u548c\u64f4\u5c55\u60a8\u7684\u696d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u907f\u514d\u6578\u64da\u5eab\u89f8\u767c\u5668\u91cd\u8907\u63d2\u5165\u6578\u64da\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u548c\u53ef\u9760\u6027\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-172517","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172517","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=172517"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172517\/revisions"}],"predecessor-version":[{"id":172518,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172517\/revisions\/172518"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=172517"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=172517"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=172517"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}